CN101835243A - Wireless access point working channel selecting method and device - Google Patents
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Abstract
The invention provides a wireless access point working channel selecting method and a wireless access point working channel selecting device. The wireless access point working channel selecting method comprises the following steps of: periodically transmitting broadcast signals outwards from an AP which is positioned in a working state; determining the interference level of an adjacent AP according to the signal strength by the AP receiving the broadcast signals; calculating the channel spacing between the working channel used by the adjacent AP and the working channel used by the AP; determining the corresponding interference degree according to the channel spacing and the preset channel spacing and an interference degree comparison table; multiplying the interference level by the interference degree to obtain the distribution information of the interference value; and selecting the working channel with the minimum interference value according to the interference distribution information. The wireless access point working channel selecting method and the wireless access point working channel selecting device can reduce the channel interference and improve the system capacity, does not need to occupy a common channel, avoids the resource waste, can be applied to the common fat AP framework and thin AP framework in the wireless local area network simultaneously, and has wide applicability.
Description
Technical field
The embodiment of the invention relates to the wireless local area network technology field, and (Access Point is called for short: AP) working channel selecting method and device to relate in particular to a kind of WAP (wireless access point).
Background technology
Be divided into thin AP (Fit AP) framework and (Fat AP) fat AP framework in the existing WLAN (wireless local area network).Fig. 1 is the structural representation of existing thin AP architecture, as shown in the figure, every AP in the thin AP architecture connects a Radio Access Controller (Access Controller by network, be called for short: AC), wherein, AP only is responsible for the reception and the transmission of wireless signal, and all exchange logics or network route are finished by AC.Can connect by router between a plurality of AC; Can be connected by switch between AC and the AP.
Fig. 2 is the structural representation of existing fat AP framework, and as shown in the figure, all functions in fat AP framework are independently finished by each AP, and AC are not set.Can connect by router and switch between a plurality of AP.
Disposed above under the situation of an AP in WLAN (wireless local area network), if adjacent AP uses identical or close working channel, then working channel may overlap, and causes frequency interferences, influences network capacity and service quality.
Existing scheme one be with one not with the channel of other channel overlaps as common channel, between AP, use common channel to carry out wireless telecommunications, consult to share out the work channel.But according to existing WLAN standard, total number of channels available is very limited, because common channel only is used for channel assignment negotiation, and can not provide service for the client, has therefore caused the waste of channel resource.
Summary of the invention
The embodiment of the invention provides a kind of wireless access point working channel selecting method and device, in order to the working channel of automatic adjustment AP, reduces frequency interferences, improves power system capacity, and can be applicable to thin AP architecture and fat AP framework.
The embodiment of the invention provides a kind of wireless access point working channel selecting method, comprising:
When WAP (wireless access point) is in running order, periodically outwards send broadcast singal;
After receiving the broadcast singal that comes from neighbours' WAP (wireless access point), determine the interference rank of described neighbours' WAP (wireless access point) according to the signal strength signal intensity of this broadcast singal;
Calculate the employed working channel of described neighbours' WAP (wireless access point) that carries in the described broadcast singal and the channel spacing between the available working channel of described WAP (wireless access point);
Determine corresponding degree of disturbance according to the described channel spacing and the default channel spacing and the degree of disturbance table of comparisons;
Described interference rank and described degree of disturbance multiplied each other obtain the distributed intelligence of interference value;
Working channel according to described interference profile Information Selection interference value minimum.
Another embodiment of the present invention provides a kind of wireless access point working channel choice device, comprising:
The broadcast singal sending module is used for when the WAP (wireless access point) of WLAN (wireless local area network) is in running order, indicates described WAP (wireless access point) periodically outwards to send broadcast singal;
Disturb the rank determination module, be used for when receiving the broadcast singal that comes from neighbours' WAP (wireless access point), determine the interference rank of described neighbours' WAP (wireless access point) according to the signal strength signal intensity of this broadcast singal;
The channel spacing computing module is used for calculating employed working channel of described neighbours' WAP (wireless access point) that described broadcast singal carries and the channel spacing between the available working channel of described WAP (wireless access point);
The degree of disturbance determination module, the described channel spacing and the default channel spacing and the degree of disturbance table of comparisons that are used for calculating according to the channel spacing computing module are determined corresponding degree of disturbance;
The distributed intelligence computing module, the described degree of disturbance that is used for disturbing described interference rank that the rank determination module determines and degree of disturbance determination module to determine multiplies each other and obtains the distributed intelligence of interference value;
Channel is selected module, is used for the working channel of the described interference profile Information Selection interference value minimum that obtains according to the distributed intelligence computing module.
Further embodiment of this invention provides a kind of WLAN (wireless local area network), adopts thin WAP (wireless access point) framework, wherein: be provided with above-mentioned wireless access point working channel choice device in the wireless controller in the described WLAN (wireless local area network).
Yet another embodiment of the invention provides a kind of WLAN (wireless local area network), adopts fat WAP (wireless access point) framework, wherein: be provided with above-mentioned wireless access point working channel choice device in the WAP (wireless access point) in the described WLAN (wireless local area network).
The present invention continues, dynamically optimizes and revises the working channel of AP by periodically sending broadcast singal according to the disturbed condition of neighbor AP, reduces channel disturbance, improves power system capacity; And need not to take common channel, avoided resource, and can be applicable to fat AP framework and thin AP architecture that WLAN (wireless local area network) is commonly used simultaneously, have the applicability of broad.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of existing thin AP architecture;
Fig. 2 is the structural representation of existing fat AP framework;
Fig. 3 is the flow chart of wireless access point working channel selecting method embodiment one of the present invention;
Fig. 4 A is the schematic diagram that sends broadcast singal in the thin AP architecture;
Fig. 4 B is the schematic diagram that sends broadcast singal in the fat AP framework;
Fig. 5 is a channel distribution example schematic of the present invention;
Fig. 6 is the flow chart of wireless access point working channel selecting method embodiment two of the present invention;
Fig. 7 is the structural representation of wireless access point working channel choice device embodiment one of the present invention;
Fig. 8 is the structural representation of wireless access point working channel choice device embodiment two of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the flow chart of wireless access point working channel selecting method embodiment one of the present invention, and as shown in the figure, this method comprises the steps:
Step 101 when WAP (wireless access point) is in running order, is periodically outwards sent broadcast singal.
Wherein, carry shared working channel and the source address of WAP (wireless access point) of sending this broadcast singal in the described broadcast singal.Particularly, in thin AP architecture, described source address is meant the IP address of the AC that this WAP (wireless access point) connects; In fat AP framework, described source address is meant this WAP (wireless access point) its own IP address.
Particularly, described broadcast singal will carry out broadcast transmission with peak power, minimum speed limit on all available working channels, all can receive with the AP around guaranteeing and obtain this broadcast singal.Shown in Fig. 4 A, for sending the schematic diagram of broadcast singal in the thin AP architecture; Shown in Fig. 4 B, for sending the schematic diagram of broadcast singal in the fat AP framework.Wherein, the direction of arrow is represented the sending direction of broadcast singal.
Wherein, described neighbours' WAP (wireless access point) is meant the AP that sends the received broadcast singal of described WAP (wireless access point), this is because if can receive broadcast singal, then may produce channel overlap and disturb, and therefore this AP will be handled as neighbours' WAP (wireless access point).
For example, in 14 channels in the 2.4GHz frequency range, dividing, if the signal strength signal intensity that certain AP receives the broadcast singal that comes from neighbor AP is-75dBm, and this broadcast singal shows that this neighbor AP uses channel 6, then can according to as the interference rank of following table 1 definite this broadcast singal be 5.
Table 1 is a signal strength signal intensity and an example that disturbs the rank table of comparisons
| Signal strength signal intensity (unit: dBm) | Disturb rank |
| ??-100 | ??0 |
| ??-95 | ??1 |
| ??-90 | ??2 |
| ??-85 | ??3 |
| ??-80 | ??4 |
| ??-75 | ??5 |
| ??-70 | ??6 |
| ??-65 | ??7 |
| ??-60 | ??8 |
| ??-55 | ??9 |
| ??-50 | ??10 |
Particularly, the difference between can the numbering of evaluation work channel is represented described channel spacing.Wherein, the numbering of described working channel is the identification information that is used to distinguish the different operating channel, Fig. 5 is a channel distribution example schematic of the present invention, as shown in the figure, in the 2.4GHz frequency range, be divided into 13 working channels, be numbered 1～13, the frequency range of each channel is 22MHz, wherein be numbered do not have between 1,6 and 11 the working channel overlapping.
Suppose, the available working channel of described AP be numbered 3, the employed working channel of neighbor AP be numbered 5, then corresponding difference is respectively: 5-3=2, expression channel spacing.
For example, when the channel spacing that calculates in above-mentioned steps 103 is 2, be 4 according to determine corresponding degree of disturbance as following table 2.
Table 2 is an example of the channel spacing and the degree of disturbance table of comparisons
| Channel spacing | Degree of disturbance |
| ± 5 and beyond | ??0 |
| ??±4 | ??1 |
| ??±3 | ??2 |
| ??±2 | ??4 |
| ??±1 | ??8 |
| ??0 | ??16 |
Table 3 is an example of channel disturbance distributed intelligence
| The numbering of working channel | Interference value |
| ??1 | ??0 |
| ??2 | ??1*5＝5 |
| ??3 | ??2*5＝10 |
| ??4 | ??4*5＝20 |
| ??5 | ??8*5＝40 |
| ??6 | ??16*5＝80 |
| The numbering of working channel | Interference value |
| ??7 | ??8*5＝40 |
| ??8 | ??4*5＝20 |
| ??9 | ??2*5＝10 |
| ??10 | ??1*5＝5 |
| ??11 | ??0 |
| ??12 | ??0 |
| ??13 | ??0 |
| ??14 | ??0 |
In addition,, then the channel disturbance distributed intelligence at different neighbor AP can be superposeed, generate channel disturbance distribution aggregate information, select the working channel of interference value minimum then according to described interference profile aggregate information if there are a plurality of neighbor AP.
The described method of present embodiment continues, dynamically optimizes and revises the working channel of AP by periodically sending broadcast singal according to the disturbed condition of neighbor AP, reduces channel disturbance, improves power system capacity; And need not to take common channel, avoided resource, and can be applicable to fat AP framework and thin AP architecture that WLAN (wireless local area network) is commonly used simultaneously, have the applicability of broad.
Fig. 6 is the flow chart of wireless access point working channel selecting method embodiment two of the present invention, as shown in the figure, can further include following steps after the described distributed intelligence that obtains interference value of step 105:
Step 201 is preserved the distributed intelligence of described interference value.
Particularly, at fat AP framework, the distributed intelligence of described interference value can be kept among the described AP; At thin AP architecture, then the distributed intelligence of described interference value can be uploaded to AC and preserve.
Step 202 is not if receive the broadcast singal that sends with the corresponding neighbor AP of the described distributed intelligence of having preserved, then with corresponding distributed intelligence deletion in Preset Time.
Owing to broadcast singal is that neighbor AP periodically sends, if in Preset Time, as in continuous three transmission cycles, do not receive the broadcast singal that respective neighbor AP sends yet, illustrate that then this neighbor AP can not cause interference to described AP again, therefore with corresponding distributed intelligence deletion, to save memory space.Particularly, the selection course of working channel can periodically be carried out, perhaps also can work as the corresponding distributed intelligence of deletion after, initiate immediately to reselect working channel, so that in time change channel.
Fig. 7 is the structural representation of wireless access point working channel choice device embodiment one of the present invention, as shown in the figure, this device 10, comprise: broadcast singal sending module 11, interference rank determination module 12, channel spacing computing module 13, degree of disturbance determination module 14, distributed intelligence computing module 15 and channel are selected module 16, and its operation principle is as follows:
When the AP in the WLAN (wireless local area network) was in running order, described AP periodically outwards sent broadcast singal by 11 indications of broadcast singal sending module, carries shared working channel and the source address of this AP of sending this broadcast singal in this broadcast singal; When receiving the broadcast singal that comes from neighbor AP, disturb rank determination module 12 to determine the interference rank of described neighbor AP according to the signal strength signal intensity of this broadcast singal, specifically can according to as the illustrated signal strength signal intensity of table 1 with disturb the rank table of comparisons definite; Employed working channel of described neighbor AP that carries in the described broadcast singal of channel spacing computing module 13 calculating and the channel spacing between the available working channel of described AP, concrete illustrates, can repeat no more referring to the related description of step 103 herein; Degree of disturbance determination module 14 is determined corresponding degree of disturbance according to the described channel spacing and the default channel spacing and the degree of disturbance table of comparisons that channel spacing computing module 13 calculates, and concrete illustrates, and can repeat no more referring to table 2 and related description thereof herein.
After this, the described degree of disturbance that distributed intelligence computing module 15 will disturb described interference rank that rank determination module 12 determines and degree of disturbance determination module 14 to determine multiplies each other and obtains the distributed intelligence of interference value, concrete illustrates, and can repeat no more referring to table 3 and related description thereof herein; Select the working channel of the described interference profile Information Selection interference value minimum that module 16 calculates according to distributed intelligence computing module 15 then by channel.
The described device of present embodiment continues, dynamically optimizes and revises the working channel of AP by periodically sending broadcast singal according to the disturbed condition of neighbor AP, reduces channel disturbance, improves power system capacity; And need not to take common channel, avoided resource, and can be applicable to fat AP framework and thin AP architecture that WLAN (wireless local area network) is commonly used simultaneously, have the applicability of broad.
For example, in adopting the WLAN (wireless local area network) of thin AP architecture, the described AP working channel of present embodiment choice device can be arranged among the AC in the described WLAN (wireless local area network); And in adopting the WLAN (wireless local area network) of fat AP framework, the described AP working channel of present embodiment choice device can be arranged among the AP in the described WLAN (wireless local area network).
Fig. 8 is the structural representation of AP working channel choice device embodiment two of the present invention, and as shown in the figure, this device 10 can also further optionally comprise: preserve module 17 and removing module 18, its operation principle is as follows:
Distributed intelligence computing module 15 in said apparatus embodiment one obtains after the distributed intelligence of interference value, is preserved by the distributed intelligence of preserving the described interference value that module 17 calculates distributed intelligence computing module 15.Particularly, at fat AP framework, the distributed intelligence of described interference value can be kept among the described AP; At thin AP architecture, then the distributed intelligence of described interference value can be uploaded to AC and preserve.
After the 17 described distributed intelligences with described interference value of preservation module are preserved, if the broadcast singal that the corresponding neighbor AP of the described distributed intelligence of not receiving in Preset Time and having preserved sends, then can be by 18 of removing modules with corresponding distributed intelligence deletion, to save memory space.Particularly, the selection course of working channel can periodically be carried out, perhaps also can work as the corresponding distributed intelligence of removing module 18 deletion after, initiate immediately to reselect working channel, so that in time change channel.
In addition, can further include laminating module 19 in this device 10.If there are a plurality of neighbor AP, can distributed intelligence computing module 15 be superposeed at the channel disturbance distributed intelligence that different neighbor AP obtain by laminating module 19, generate channel disturbance distribution aggregate information; Select module 16 to select the working channel of interference value minimum according to described interference profile aggregate information by channel then.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a wireless access point working channel selecting method is characterized in that, comprising:
When WAP (wireless access point) is in running order, periodically outwards send broadcast singal;
After receiving the broadcast singal that comes from neighbours' WAP (wireless access point), determine the interference rank of described neighbours' WAP (wireless access point) according to the signal strength signal intensity of this broadcast singal;
Calculate the employed working channel of described neighbours' WAP (wireless access point) that carries in the described broadcast singal and the channel spacing between the available working channel of described WAP (wireless access point);
Determine corresponding degree of disturbance according to the described channel spacing and the default channel spacing and the degree of disturbance table of comparisons;
Described interference rank and described degree of disturbance multiplied each other obtain the distributed intelligence of interference value;
Working channel according to described interference profile Information Selection interference value minimum.
2. method according to claim 1 is characterized in that the described distributed intelligence that obtains interference value comprises afterwards: the distributed intelligence of described interference value is preserved.
3. method according to claim 2, it is characterized in that described distributed intelligence with described interference value also comprises after preserving: if in Preset Time, do not receive the broadcast singal that sends with the corresponding neighbours' WAP (wireless access point) of the described distributed intelligence of having preserved, then with corresponding distributed intelligence deletion.
4. method according to claim 1 is characterized in that:
The described distributed intelligence that obtains interference value also comprises afterwards: will superpose at the channel disturbance distributed intelligence of different neighbours' WAP (wireless access point), generate channel disturbance distribution aggregate information;
Described working channel according to described interference profile Information Selection interference value minimum comprises: the working channel of selecting the interference value minimum according to described interference profile aggregate information.
5. a wireless access point working channel choice device is characterized in that, comprising:
The broadcast singal sending module is used for when the WAP (wireless access point) of WLAN (wireless local area network) is in running order, indicates described WAP (wireless access point) periodically outwards to send broadcast singal;
Disturb the rank determination module, be used for when receiving the broadcast singal that comes from neighbours' WAP (wireless access point), determine the interference rank of described neighbours' WAP (wireless access point) according to the signal strength signal intensity of this broadcast singal;
The channel spacing computing module is used for calculating employed working channel of described neighbours' WAP (wireless access point) that described broadcast singal carries and the channel spacing between the available working channel of described WAP (wireless access point);
The degree of disturbance determination module, the described channel spacing and the default channel spacing and the degree of disturbance table of comparisons that are used for calculating according to the channel spacing computing module are determined corresponding degree of disturbance;
The distributed intelligence computing module, the described degree of disturbance that is used for disturbing described interference rank that the rank determination module determines and degree of disturbance determination module to determine multiplies each other and obtains the distributed intelligence of interference value;
Channel is selected module, is used for the working channel of the described interference profile Information Selection interference value minimum that obtains according to the distributed intelligence computing module.
6. device according to claim 5 is characterized in that also comprising: preserve module, the distributed intelligence that is used for described interference value that the distributed intelligence computing module is calculated is preserved.
7. device according to claim 6, it is characterized in that also comprising: removing module, be used for after the described distributed intelligence with described interference value of preservation module is preserved, if the broadcast singal that the corresponding neighbours' WAP (wireless access point) of the described distributed intelligence of not receiving in Preset Time and having preserved sends is then with corresponding distributed intelligence deletion.
8. device according to claim 5 is characterized in that also comprising:
Laminating module is used for the distributed intelligence computing module is superposeed at the channel disturbance distributed intelligence that different neighbours' WAP (wireless access point) obtain, and generates channel disturbance distribution aggregate information;
Described channel selects module also to be used for selecting according to described interference profile aggregate information the working channel of interference value minimum.
9. a WLAN (wireless local area network) adopts thin WAP (wireless access point) framework, it is characterized in that: be provided with arbitrary described wireless access point working channel choice device in the claim 5～8 in the wireless controller in the described WLAN (wireless local area network).
10. a WLAN (wireless local area network) adopts fat WAP (wireless access point) framework, it is characterized in that: be provided with arbitrary described wireless access point working channel choice device in the claim 5～8 in the WAP (wireless access point) in the described WLAN (wireless local area network).
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